Low Voltage Extraction Switch Cabinet

● Performance index

The design of the GCS type Low Voltage Extraction Switch Cabinet meets the following standards :

▶IEC439-1 Low-voltage switchgear and controlgear

▶GB7251 Low-voltage switchgear

▶ZBK36001 Low-voltage Pull-out switchgear

● Basic parameters

● Main structure

▶The main frame of GCS type Low Voltage Extraction Switch Cabinet adopts 8MF type open section steel, and the two sides of the section steel have installation holes with the modulus of 20mm and 100mm and ①9.2mm respectively, so the internal installation is flexible and convenient.

▶The main frame is designed in two assembly forms, namely, fully assembled structure and partially welded structure (side frame and cross beam) for users to choose.

▶Each functional room of the device is isolated from each other, and its compartments are divided into functional unit room, bus room and cable room. The functions of each chamber are relatively independent.

▶The horizontal main bus is arranged horizontally behind the cabinet, which is the basic measure to make the main circuit of the device have high short-circuit strength.

▶The design of the cable compartment makes it very convenient for cables to go up and down.

▶Size series of general cabinet of the device (see the table below):

● Function unit

1. The height of the drawer is 160mm. It is divided into 1/2 unit, 1 unit, 3/2 unit, 2 unit, 3 unit and five size series. The rated current of unit circuit is 400A or less.

2. The drawer changes only in the height dimension, and its width and depth dimension remain unchanged. Drawers with the same functional units have good interchangeability.

3. Each MCC cabinet can be equipped with at most 11 one-unit drawers or 22 1/2-unit drawers. Wherein more than one unit of drawer adopts a multifunctional back plate.

4. According to the current, the inlet and outlet lines of the drawer adopt different number of plug-ins with the same chip structure.

5. 1/2 unit drawer and cable room are connected by ZJ-2 adapter with back plate structure.

6. The connection between the unit drawer and the cable room adopts ZJ-1 adapter with the same size bar or tube structure according to the current grading.

7. The drawer unit is equipped with mechanical interlocking device.

● Main electrical components

The selection principle of main electrical components is based on imported technology, which can be produced in series in China and meet the requirements of high performance of the device

▶The breaker of power supply and feeder unit mainly selects AH series. Other M series produced by Schneider Company and F series produced by ABB Company with more advanced performance can also be selected. AH circuit breaker has the characteristics of good performance, compact structure, light weight and strong series. The price is relatively low, the maintenance and use are convenient, and all performance indexes can meet the requirements of this device.

▶Drawer unit (motor control unit, partial feed unit) circuit breakers mainly choose CM1 and TG.TM30 series plastic case circuit breakers, and some choose NZM- produced by MOELLER Company. 100A series. These switches have the characteristics of good performance, compact structure, short arcing or no arcing, and high technical and economic indicators, which can meet the requirements of this device.

▶The isolating switch and fuse isolating switch shall be Q series. This series has high reliability and strong breaking ability, and can realize mechanical interlocking.

▶The main fuse is NT series. 5. AC contactors shall be of series B and LCI-D..

● Characteristics of GCS Type Low Voltage Extraction Switch Cabinet

1. Improve the heat capacity of the adapter, and greatly reduce the additional temperature rise caused by the temperature rise of the adapter to the connector, cable head and spacer.

2. The separation between functional units and compartments is clear and reliable, and the failure of one unit will not affect the work of other units, so that the failure is limited to the minimum range.

3. The horizontal arrangement of buses makes the device have good dynamic and thermal stability and can withstand the impact of 80/176kA short-circuit current.

4. The number of circuits in a single 4.MCC cabinet is as many as 22, fully considering the needs of automatic electric doors (machines) in power generation, petrochemical systems and other industries with large single unit capacity.

5. The connection between the device and the external cable is completed in the cable compartment, and the cable can go up and down. The current transformer is installed in the cable compartment, which makes the installation and maintenance convenient.

6. In the same power distribution system, the short-circuit current can be limited by matching current-limiting reactors, the bus voltage can be stabilized at a certain value, and the requirements for short-circuit strength of components can be partially reduced.

7. The drawer unit has a sufficient number of secondary connectors (32 pairs for unit 1 and above and 20 pairs for unit 1/2), which can meet the requirements of computer interface and automatic control loop for the number of contacts

● Auxiliary circuit

The design of auxiliary circuit diagram conforms to the technical regulations for auxiliary power design of thermal power plants and other relevant design technical regulations. It is suitable for the low-voltage power system of power plants and substations and the low-voltage power distribution system in factories, mines and high-rise buildings. The auxiliary circuit scheme of factories and mines is designed according to the main circuit scheme, which is divided into functional units of power supply incoming line, feeder line (PC) and motor feeder line (MCC)..

● Product package

The manufacturer shall provide the following documents and accessories when supplying:

▶Device list

▶Product certificate

▶Instructions for use

▶Factory test report

▶Relevant electrical drawings

▶Cabinet door keys, operating handles and spare parts specified in the contract.

▶Installation instructions of main components

● Ordering instructions

The order contract of GCS Type Low Voltage Extraction Switch Cabinet contains the following contents:

▶The full model of the product includes the main circuit scheme number and the auxiliary circuit scheme number.

▶Main circuit system combination sequence diagram

▶Electrical schematic diagram of auxiliary circuit

▶List of components in the cabinet

▶Setting parameters such as voltage, current and time in the circuit.

▶Other special tables inconsistent with the normal use of the product.